266554642609 has 2 divisors, whose sum is σ = 266554642610. Its totient is φ = 266554642608.

The previous prime is 266554642591. The next prime is 266554642619. The reversal of 266554642609 is 906246455662.

266554642609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259867491984 + 6687150625 = 509772^2 + 81775^2 .

It is a cyclic number.

It is not a de Polignac number, because 266554642609 - 2³³ = 257964708017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 266554642609.

It is not a weakly prime, because it can be changed into another prime (266554642619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133277321304 + 133277321305.

It is an arithmetic number, because the mean of its divisors is an integer number (133277321305).

Almost surely, 2^266554642609 is an apocalyptic number.

It is an amenable number.

266554642609 is a deficient number, since it is larger than the sum of its proper divisors (1).

266554642609 is an equidigital number, since it uses as much as digits as its factorization.

266554642609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18662400, while the sum is 55.

The spelling of 266554642609 in words is "two hundred sixty-six billion, five hundred fifty-four million, six hundred forty-two thousand, six hundred nine".